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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0e369360bc001705d99c8734962f62de635f2ae13e3b093c2e419209251bc7' 
  AND token = 'GoSVr7SXGaFJaRZ4IOzTOFB1HgZUEdeHDSA/g1+I9W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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