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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eebdd1ea9832301d2e44364fc8ee7309333326cfe32fce84e475b141f4a9f96' 
  AND token = 'XpM/ycDzRA3t65ZvRdNV8zun6sLzsou7VqyndSAX2HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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