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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98429142b6e680e43f6a40ffd41a364b03f69214f81c19eace8e6b9f71d6677' 
  AND token = 'sGrSRT/nsSjGl7uK2hI7UcOSZZMqfMBquWAo35yvoIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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