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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb7f3623f230460b7638864b79c75d07c0ade3d3722e81f9a8fb69ce231010d' 
  AND token = 'DdnYsFfpiqhzwQTHzlgP81uBrJ90WngLe2xTCOZo1MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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