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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dcd3b09d0e7da3309e8f5d5a8a59106db17a92a7c51388dfa1e1c392a94e02' 
  AND token = 'AWOyiI9EumyVXX4hag6Dkv+5mugHibyBPtbn1rT+Ycs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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