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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833e1073d40548e1856d42d2ba88e000bbec978b2dd8ead78ca1b56d4b870eec' 
  AND token = 'PBW8vsFviZHn2uFvqgElyJRKbKFo4w+JJDatGametjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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