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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20711f65d03a39c4d7faa69c15c7220eaf2617926d85aad754c4ecf9aa1cb91' 
  AND token = '+8po03eL0DZfz8lwDLhbI5JAObASnkmXl8xTZVMadSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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