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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0994a4398cd3e3c19fa44883ef70e7cedbe3ba484eccce829a9bd81feade16f3' 
  AND token = '/3z3OsP0tL2rDvfr+YeketGPL9W1rKzCrEKlInNUBm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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