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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2476d2d8cfaa473a5cbf089463724a71321af0f6680610b52f5becb79973b7' 
  AND token = 'g4zlZeSm2J7U6/9z5i4+OmtxR0m2tavwUSqVoo52sQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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