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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c5920e7ada8046b65f6781b95a4a527851bacabe000d0c39f41513d2926ef0' 
  AND token = 'krb+wdhLO/YEK+ORLggoBHgE6NcZ7crN4/6wEATYwvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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