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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cc96f97e81cf249e69861de9478a8c34636469de2ea0e173e729df90367ac4' 
  AND token = '9+r+Pl7v5yw1+GQp1C59MiYfqrG679WPVk4TSBde4yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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