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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f675b19543f8b5a600c2a5ab1ce85b46064d0461e329ada3ea115394f5d01cfa' 
  AND token = 'A/kvdF+fEt2V/nlZt7I61OG69pQNiWUp4eUI+eHc8gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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