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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300d603f8854bf53aa79a59ceab47a623341ecb139ba3e3dcfdc04f45f51f3df' 
  AND token = 'VxdURSbKOM2ARfU7uvkl2PABhb6oMz8jlXgCsCXXkrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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