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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8386b69e7bac50bd7d2f103aff7c98cd413c47e9eacf703093eb077abeecfa' 
  AND token = 'lDaWu07MA93e7q3akGNzwzzRRm6UkxTd3FiLszr0pdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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