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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bb247e55d9ae77f35d6c2c8441ccb10d434a30332bd0a5f96f4439b8d52377' 
  AND token = 'X0UaYwzAeBbk6cY7jHmnes0MD6aphrHWcHwwkbF9pl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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