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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f816e01ff63e158985820a1fdf3b62b7bbceaa7b902a732241e5a81d9a2560b' 
  AND token = 'aawUu5woAf4vkJyV08xP0Dsj/OGbzs5Zse6ExsXdL5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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