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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1680bdce675636e0736f7b8e70745bb604e98e09a66605f5164e08a883c511dd' 
  AND token = 'g0s4EPU/0wiX+4uFgSTY9kEv7dQCmUDQXKq9K8/VVTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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