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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2d927652a3ba3e80705e0134a6d61d2bc5a93978c4edcd2a3b590814e36cc7' 
  AND token = '3g8+iDw8R3unwFJ7Kdi5SUcNMBcPd8JUFnf2HdRQB9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

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