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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8336bb70720753febe7dcf136552133e14ebfb98fa1cfac12973cba37e71f6' 
  AND token = 'o9bSM6NJW49N5xnWAxDLbROawpBMf3HALv+LzeMKfuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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