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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2914cf32b2f6631679e0c9f6d5059f253fd8450cbd43d022d3867eccaf42e10a' 
  AND token = 'SCfnd9hSJJshrtG9GazwrI1KlZrcXIx6704Eg7Q1v/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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