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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478b685fe5a4f9aab6e89a83a1f0f541a8adc055e835a2bff5389bfb776539a5' 
  AND token = '9jo+p4oLy3HX1K/2jIqqVY/btob2MisMIyMa2DEhXRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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