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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333905d2f025b35b7dd0c4b8e9d8671657d9d03575c4eed0642ce5915a77164d' 
  AND token = 'X2pWhkKpwsv/Lj5KCljyh2k5hKVXZkaK90wn0E3rM2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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