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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e52f6b308af4641b72b2d1a26c1ea297cbfa901dc7221d015ba3c961fc8af1' 
  AND token = 'dRfOvIBOR6PII7vjl9rjlED8X21FVTJt/yhve0fZTKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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