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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ec7a397de4e46236cdcae96d7fa6829494971c494abb0a1d13c1b3a7624e6b' 
  AND token = 'LXB49gn8KH3arZb1ccSnv8UiisHiZwR4q8TnoqYwddw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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