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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8926a1ebbe8ae06d7d5a7aa84900bffcdb101f0e0f0b154eebdc7c0adad75c26' 
  AND token = 'bP+Xb94KxXVbB+/WKVGCaWkKeFwEj48SICheDYDzqN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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