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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1f2883f44fe5725dd2c33d0ce570408076d66ba1f6cc590199c44dfd6e2c16' 
  AND token = 'MhJUpFhcBUzHXn2esSNX6X36PvYcpNZ/Ar0IXGsi7oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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