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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea83150cb682eb77629ac1d026ca2187162c0b5bb88b61ad4f8d584db8265cb' 
  AND token = '9WY460XXEAa+o2sYqqerICW2CfeSneqVn98UuXDEn0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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