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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdab907af485edd27e2686caf4083eead8ab68635b42e0099e026a5e3172dad9' 
  AND token = 'KWaBdBxjORtsWdYV5/urOUP0J2Mx+Bo6n0U5WtcNkh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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