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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1cf7b30611c8a983fe4f6b9dbad207f72ba8c445df1fc9e0d5e9e8d839c40b' 
  AND token = 'bp5UPIm+TeVP+6y5LQK5YYcItOWg3AhrLxXOzjwbixs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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