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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555c9377ead4c7c36c31f563802245f2f9884ebedbf86883d4852ea25a8ce07b' 
  AND token = '/GdcslSLchr1m+HThutuSfH5iknnex4Vf86AptPLAQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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