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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58ceb4d448b554f659713c02ba897c1753c12e725600526b3217def42d209fc' 
  AND token = 'tifx4pr0pawLH7z5LWZzyJcAm5ZaM+vZJ8B711dJoVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00200

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}