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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b52d96b737fa8eb0dc5ef0f87561fd8732a4556aa62bc707d021ad3d7693044' 
  AND token = 'dW3zIfS6fbc3BpO4CjTh/882viA0UoNXJhfp29D0k3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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