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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13741e8e4da216ed6bc0d2f2d8cfff5161c12349636550f7bdcd4603c8ab19d' 
  AND token = 'CrTaOfVhk7lM96CFg7UdrbUq3Z+V+tW2Kb3GUQHJVAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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