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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0619a9a3be4c89c4b71e08e9a9df424c0f7346deb31908e50eca4d36cbbbf4bf' 
  AND token = '5HorQ8YUgAukCSCqY63t1Fh6AJhXoiy5ZdQiXe8fOZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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