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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0211ad91f798dbc1fbebd1d82a70d83fe84b769e722762d07566c574975f56f' 
  AND token = 'QP1OpZgaTMyn2oKHt6Xgxm6zFC6SN4aTfDshE0hiwRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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