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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8e9ff978874d92d9e2c8297a7afe12b17fd8250d04f51e71540fec02ba0a9b' 
  AND token = 'bKlrrzFRRQ6XL0x1h3ylH7Yzkzpk57MtUoWDwywNbbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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