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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104ef13cb54eeccb74f2c3c288f54eff89d22eb22c7f5c8d072ed2ddb40e90cf' 
  AND token = 'tCZBq0fVbGuvIuOk8OrekCGQE7azIH4c/mLZAU81yXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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