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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13be3aa24b4430f375a28cdbb438fe9db0618f0154e591672093f87441ee5b53' 
  AND token = 'n/YGKfb4RCD+p/h3Q3F0vPTzTYJgmb6gHTr2m3IS91M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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