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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec3b4a413aacc2b181fbf67b2fdc3b8c578e72262670e4bf26f22bcee83390a' 
  AND token = 'X3cmaivJMi+JXcWUzNbAyi6hHBph54ffE9HJgNeBXkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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