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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d989269983c257e89b3aef716ae1888872fab664b29fc7e9267a697a79b5572' 
  AND token = 'jM6X4bp5+y7vpLpg6QyMNsGKgdfHCKIt5wiYsVpeaDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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