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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23b9cce4eb69b4b40d2164de816799e200f8cf9cac5822b11bb5880dc718e18' 
  AND token = 'GqtANvJYbRSlrNroDrDHqk1+mUUqxx0pyV96Hung9E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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