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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de833b779fbbbf8fca8468b0155adfd3a8ca8b32ae0f3cd0ea9bd327309199b' 
  AND token = 'MAdrcqOoQ593VHIFgG2VYCMm5HN5B/RairvM4GErfp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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