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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b56561d1443d3fcfe5dbd2260c07b85a2e4b50fa6b5cf90ab119d35db23067b' 
  AND token = '/+wRcnfFzcv/UGPxy6SGCowdINwYgy9QZPrNIzb5QOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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