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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b85c03c811274afccba2e9f83e05cc3f5a76f21b25579e7c45d9c1f195f2b6' 
  AND token = 'haBNamKyJCBZbWxHxwOoDvsFaHof3r153AJSwnPLAA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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