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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90023c6faa0174727ff2f6880a30a8e523bd10c781cd3dc9a6fa66f15280f7f7' 
  AND token = 'zwkcfhW01YjPCGHvrSnymWjPDIGfEY4ekBTv1r8bkCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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