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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbd40c12e78141c04f016b08e9f0ab285319898c57043a7b1f91515a27454c0' 
  AND token = 'J3rKhO5wu2l48EjWtOUj0Za1NucJk+SPB/wHA72kjxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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