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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05ca1fe46d398a32b3cc634e3273054914219b140a1a7bc003a503c60a42e62' 
  AND token = 'pu81MF1f3OPBXIFTV/0/Zchfyjc6VQv3zMZnpcAI4hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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