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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b141f779fa085b6f4c614403566a059b819c9e2c8cda7f97deb7db31b33bbe' 
  AND token = 'sdkifaFTOnIecgHPfE/WZEzB/8B5wov4ReX6X9l3fUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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