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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e7dd6ed563315716a554b7081e4df504c1f94860c28171e50b0b45d53c246c' 
  AND token = 'nScn/toewGh8jbbOsbd1VgKnLMLq4QXLXnL4AA6x+lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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