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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c0221d44040c0310e642c4621780ee85df404ad16411cc0e1f2a2b05ae1969' 
  AND token = 'jLikTUQ7WqdNgRSZRlXbWcGMQdFo7SJvxzHjw3grw0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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