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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ffc6c82dfe01e06daddbb30c20ffda2e021064c63c0f8f68018ab1cab2f6e9' 
  AND token = '1okqaisybdCuPQ79HBXe9y/GYsZrudcoxVvG/9/fBIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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