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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2640b52c00e5e5a69d1784054b23fd86cb34371537ffbade82d19912e55c22' 
  AND token = 'asVvBOr1XNJE+3coJc6+8tDCDH1jERHMWuUN1pcvnlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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