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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87943b0f8ae5985669fbdc216e64e9acbc74f6a3615a5bf382aa139de787146' 
  AND token = '8z/HVNfBEjo4epWQLMbubgY6DiPIy7C72ua7ditG27E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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