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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e3106ba010ca17c79a2b75bdfa854406d5a2f0c58292a45c7a70f925845b76' 
  AND token = 'L1IzwZARhYyLV7EOycPNo83twfQBiAIHNtXQzcrB1BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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