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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755600c79b7cd0e4825b1d5d75528e7fcf75aaffaa49dc2674682493beb82383' 
  AND token = '8l6zt4TNxgeKIskU6t8GEdee+K4ZiRUoLemQyROhMGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00347

JSON explain

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