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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ff02ea87d0f8cd70d2dbb12a5ca0b78f54cd774d0d51994921ca4651ad09b4' 
  AND token = 'lozheBauDDromNS8VtgcN+qvBWNGvxOyONdjok+NzkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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