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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7dcd026cd91f7060eea04e7f4d16de4dd310f8dbaddbe90d2b225c31ba54508' 
  AND token = 'sjr/W5cvtUAjFnwCEI4dZK2lQP31lJKqQAXVmsG3x1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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