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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbd7d615bf8200d671c849b8c8ed7e994b80612b7e8003bcea6d079ee259345' 
  AND token = 'l9Eb6rHVOf8+PiY6EZxOd+qCC+QqfA2J+07GReAvAKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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