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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476a4a272719345d37d31388cb977749b58e6437dd189d4f6f373a15a210dafe' 
  AND token = '2Jt6VtT/Gfn1/kx3noaeDlZfcSFVp1qqYYSBcnCNnEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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