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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b42abb73f725d50f35264c60aaf15042c0c2e0b7f81ad028658f274e597fa8' 
  AND token = 'L9UCZ0+hvHcrzQ3EyV9WwM+ZBeyKezMLr4LIeEDVpe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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